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<div class="refentry">
<a name="GstTagSetter"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GstTagSetter.top_of_page"></a>GstTagsetter</span></h2>
<p>GstTagsetter — Element interface that allows setting and retrieval
                    of media metadata</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="GstTagSetter.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstTagSetter.html#gst-tag-setter-reset-tags" title="gst_tag_setter_reset_tags ()">gst_tag_setter_reset_tags</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstTagSetter.html#gst-tag-setter-merge-tags" title="gst_tag_setter_merge_tags ()">gst_tag_setter_merge_tags</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstTagSetter.html#gst-tag-setter-add-tags" title="gst_tag_setter_add_tags ()">gst_tag_setter_add_tags</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstTagSetter.html#gst-tag-setter-add-tag-value" title="gst_tag_setter_add_tag_value ()">gst_tag_setter_add_tag_value</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstTagSetter.html#gst-tag-setter-add-tag-values" title="gst_tag_setter_add_tag_values ()">gst_tag_setter_add_tag_values</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstTagSetter.html#gst-tag-setter-add-tag-valist" title="gst_tag_setter_add_tag_valist ()">gst_tag_setter_add_tag_valist</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstTagSetter.html#gst-tag-setter-add-tag-valist-values" title="gst_tag_setter_add_tag_valist_values ()">gst_tag_setter_add_tag_valist_values</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <a class="link" href="GstTagList.html" title="GstTagList"><span class="returnvalue">GstTagList</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstTagSetter.html#gst-tag-setter-get-tag-list" title="gst_tag_setter_get_tag_list ()">gst_tag_setter_get_tag_list</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstTagSetter.html#gst-tag-setter-set-tag-merge-mode" title="gst_tag_setter_set_tag_merge_mode ()">gst_tag_setter_set_tag_merge_mode</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstTagList.html#GstTagMergeMode" title="enum GstTagMergeMode"><span class="returnvalue">GstTagMergeMode</span></a>
</td>
<td class="function_name">
<a class="link" href="GstTagSetter.html#gst-tag-setter-get-tag-merge-mode" title="gst_tag_setter_get_tag_merge_mode ()">gst_tag_setter_get_tag_merge_mode</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstTagSetter.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="GstTagSetter.html#GstTagSetter-struct" title="GstTagSetter">GstTagSetter</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstTagSetter.html#GstTagSetterInterface" title="struct GstTagSetterInterface">GstTagSetterInterface</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstTagSetter.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/usr/share/gtk-doc/html/gobject/GTypeModule.html">GInterface</a>
    <span class="lineart">╰──</span> GstTagSetter
</pre>
</div>
<div class="refsect1">
<a name="GstTagSetter.prerequisites"></a><h2>Prerequisites</h2>
<p>
GstTagSetter requires
 <a class="link" href="GstElement.html" title="GstElement">GstElement</a>.</p>
</div>
<div class="refsect1">
<a name="GstTagSetter.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/gst.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="GstTagSetter.description"></a><h2>Description</h2>
<p>Element interface that allows setting of media metadata.</p>
<p>Elements that support changing a stream's metadata will implement this
interface. Examples of such elements are 'vorbisenc', 'theoraenc' and
'id3v2mux'.</p>
<p>If you just want to retrieve metadata in your application then all you
need to do is watch for tag messages on your pipeline's bus. This
interface is only for setting metadata, not for extracting it. To set tags
from the application, find tagsetter elements and set tags using e.g.
<a class="link" href="GstTagSetter.html#gst-tag-setter-merge-tags" title="gst_tag_setter_merge_tags ()"><code class="function">gst_tag_setter_merge_tags()</code></a> or <a class="link" href="GstTagSetter.html#gst-tag-setter-add-tags" title="gst_tag_setter_add_tags ()"><code class="function">gst_tag_setter_add_tags()</code></a>. Also consider
setting the <a class="link" href="GstTagList.html#GstTagMergeMode" title="enum GstTagMergeMode"><span class="type">GstTagMergeMode</span></a> that is used for tag events that arrive at the
tagsetter element (default mode is to keep existing tags).
The application should do that before the element goes to <a class="link" href="GstElement.html#GST-STATE-PAUSED:CAPS"><code class="literal">GST_STATE_PAUSED</code></a>.</p>
<p>Elements implementing the <a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a> interface often have to merge
any tags received from upstream and the tags set by the application via
the interface. This can be done like this:</p>
<div class="informalexample">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19</pre></td>
        <td class="listing_code"><pre class="programlisting">GstTagMergeMode merge_mode<span class="gtkdoc opt">;</span>
<span class="gtkdoc kwb">const</span> GstTagList <span class="gtkdoc opt">*</span>application_tags<span class="gtkdoc opt">;</span>
<span class="gtkdoc kwb">const</span> GstTagList <span class="gtkdoc opt">*</span>event_tags<span class="gtkdoc opt">;</span>
GstTagSetter <span class="gtkdoc opt">*</span>tagsetter<span class="gtkdoc opt">;</span>
GstTagList <span class="gtkdoc opt">*</span>result<span class="gtkdoc opt">;</span>

tagsetter <span class="gtkdoc opt">=</span> <span class="function">GST_TAG_SETTER</span> <span class="gtkdoc opt">(</span>element<span class="gtkdoc opt">);</span>

merge_mode <span class="gtkdoc opt">=</span> <span class="function"><a href="GstTagSetter.html#gst-tag-setter-get-tag-merge-mode">gst_tag_setter_get_tag_merge_mode</a></span> <span class="gtkdoc opt">(</span>tagsetter<span class="gtkdoc opt">);</span>
application_tags <span class="gtkdoc opt">=</span> <span class="function"><a href="GstTagSetter.html#gst-tag-setter-get-tag-list">gst_tag_setter_get_tag_list</a></span> <span class="gtkdoc opt">(</span>tagsetter<span class="gtkdoc opt">);</span>
event_tags <span class="gtkdoc opt">= (</span><span class="gtkdoc kwb">const</span> GstTagList <span class="gtkdoc opt">*)</span> element<span class="gtkdoc opt">-&gt;</span>event_tags<span class="gtkdoc opt">;</span>

<span class="function"><a href="gstreamer-GstInfo.html#GST-LOG-OBJECT:CAPS">GST_LOG_OBJECT</a></span> <span class="gtkdoc opt">(</span>tagsetter<span class="gtkdoc opt">,</span> <span class="string">&quot;merging tags, merge mode = %d&quot;</span><span class="gtkdoc opt">,</span> merge_mode<span class="gtkdoc opt">);</span>
<span class="function"><a href="gstreamer-GstInfo.html#GST-LOG-OBJECT:CAPS">GST_LOG_OBJECT</a></span> <span class="gtkdoc opt">(</span>tagsetter<span class="gtkdoc opt">,</span> <span class="string">&quot;event tags: %&quot;</span> GST_PTR_FORMAT<span class="gtkdoc opt">,</span> event_tags<span class="gtkdoc opt">);</span>
<span class="function"><a href="gstreamer-GstInfo.html#GST-LOG-OBJECT:CAPS">GST_LOG_OBJECT</a></span> <span class="gtkdoc opt">(</span>tagsetter<span class="gtkdoc opt">,</span> <span class="string">&quot;set   tags: %&quot;</span> GST_PTR_FORMAT<span class="gtkdoc opt">,</span> application_tags<span class="gtkdoc opt">);</span>

result <span class="gtkdoc opt">=</span> <span class="function"><a href="GstTagList.html#gst-tag-list-merge">gst_tag_list_merge</a></span> <span class="gtkdoc opt">(</span>application_tags<span class="gtkdoc opt">,</span> event_tags<span class="gtkdoc opt">,</span> merge_mode<span class="gtkdoc opt">);</span>

<span class="function"><a href="gstreamer-GstInfo.html#GST-LOG-OBJECT:CAPS">GST_LOG_OBJECT</a></span> <span class="gtkdoc opt">(</span>tagsetter<span class="gtkdoc opt">,</span> <span class="string">&quot;final tags: %&quot;</span> GST_PTR_FORMAT<span class="gtkdoc opt">,</span> result<span class="gtkdoc opt">);</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p></p>
</div>
<div class="refsect1">
<a name="GstTagSetter.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-tag-setter-reset-tags"></a><h3>gst_tag_setter_reset_tags ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_tag_setter_reset_tags (<em class="parameter"><code><a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a> *setter</code></em>);</pre>
<p>Reset the internal taglist. Elements should call this from within the
state-change handler.</p>
<div class="refsect3">
<a name="gst-tag-setter-reset-tags.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>setter</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-tag-setter-merge-tags"></a><h3>gst_tag_setter_merge_tags ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_tag_setter_merge_tags (<em class="parameter"><code><a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a> *setter</code></em>,
                           <em class="parameter"><code>const <a class="link" href="GstTagList.html" title="GstTagList"><span class="type">GstTagList</span></a> *list</code></em>,
                           <em class="parameter"><code><a class="link" href="GstTagList.html#GstTagMergeMode" title="enum GstTagMergeMode"><span class="type">GstTagMergeMode</span></a> mode</code></em>);</pre>
<p>Merges the given list into the setter's list using the given mode.</p>
<div class="refsect3">
<a name="gst-tag-setter-merge-tags.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>setter</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>a tag list to merge from</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mode</p></td>
<td class="parameter_description"><p>the mode to merge with</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-tag-setter-add-tags"></a><h3>gst_tag_setter_add_tags ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_tag_setter_add_tags (<em class="parameter"><code><a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a> *setter</code></em>,
                         <em class="parameter"><code><a class="link" href="GstTagList.html#GstTagMergeMode" title="enum GstTagMergeMode"><span class="type">GstTagMergeMode</span></a> mode</code></em>,
                         <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *tag</code></em>,
                         <em class="parameter"><code>...</code></em>);</pre>
<p>Adds the given tag / value pairs on the setter using the given merge mode.
The list must be terminated with <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p>
<div class="refsect3">
<a name="gst-tag-setter-add-tags.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>setter</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mode</p></td>
<td class="parameter_description"><p>the mode to use</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>tag</p></td>
<td class="parameter_description"><p>tag to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p>more tag / value pairs to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-tag-setter-add-tag-value"></a><h3>gst_tag_setter_add_tag_value ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_tag_setter_add_tag_value (<em class="parameter"><code><a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a> *setter</code></em>,
                              <em class="parameter"><code><a class="link" href="GstTagList.html#GstTagMergeMode" title="enum GstTagMergeMode"><span class="type">GstTagMergeMode</span></a> mode</code></em>,
                              <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *tag</code></em>,
                              <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gobject/gobject-Generic-values.html#GValue-struct"><span class="type">GValue</span></a> *value</code></em>);</pre>
<p>Adds the given tag / GValue pair on the setter using the given merge mode.</p>
<div class="refsect3">
<a name="gst-tag-setter-add-tag-value.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>setter</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mode</p></td>
<td class="parameter_description"><p>the mode to use</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>tag</p></td>
<td class="parameter_description"><p>tag to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>GValue to set for the tag</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-tag-setter-add-tag-values"></a><h3>gst_tag_setter_add_tag_values ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_tag_setter_add_tag_values (<em class="parameter"><code><a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a> *setter</code></em>,
                               <em class="parameter"><code><a class="link" href="GstTagList.html#GstTagMergeMode" title="enum GstTagMergeMode"><span class="type">GstTagMergeMode</span></a> mode</code></em>,
                               <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *tag</code></em>,
                               <em class="parameter"><code>...</code></em>);</pre>
<p>Adds the given tag / GValue pairs on the setter using the given merge mode.
The list must be terminated with <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p>
<div class="refsect3">
<a name="gst-tag-setter-add-tag-values.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>setter</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mode</p></td>
<td class="parameter_description"><p>the mode to use</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>tag</p></td>
<td class="parameter_description"><p>tag to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>...</p></td>
<td class="parameter_description"><p>more tag / GValue pairs to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-tag-setter-add-tag-valist"></a><h3>gst_tag_setter_add_tag_valist ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_tag_setter_add_tag_valist (<em class="parameter"><code><a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a> *setter</code></em>,
                               <em class="parameter"><code><a class="link" href="GstTagList.html#GstTagMergeMode" title="enum GstTagMergeMode"><span class="type">GstTagMergeMode</span></a> mode</code></em>,
                               <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *tag</code></em>,
                               <em class="parameter"><code><span class="type">va_list</span> var_args</code></em>);</pre>
<p>Adds the given tag / value pairs on the setter using the given merge mode.
The list must be terminated with <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p>
<div class="refsect3">
<a name="gst-tag-setter-add-tag-valist.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>setter</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mode</p></td>
<td class="parameter_description"><p>the mode to use</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>tag</p></td>
<td class="parameter_description"><p>tag to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>var_args</p></td>
<td class="parameter_description"><p>tag / value pairs to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-tag-setter-add-tag-valist-values"></a><h3>gst_tag_setter_add_tag_valist_values ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_tag_setter_add_tag_valist_values (<em class="parameter"><code><a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a> *setter</code></em>,
                                      <em class="parameter"><code><a class="link" href="GstTagList.html#GstTagMergeMode" title="enum GstTagMergeMode"><span class="type">GstTagMergeMode</span></a> mode</code></em>,
                                      <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *tag</code></em>,
                                      <em class="parameter"><code><span class="type">va_list</span> var_args</code></em>);</pre>
<p>Adds the given tag / GValue pairs on the setter using the given merge mode.
The list must be terminated with <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p>
<div class="refsect3">
<a name="gst-tag-setter-add-tag-valist-values.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>setter</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mode</p></td>
<td class="parameter_description"><p>the mode to use</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>tag</p></td>
<td class="parameter_description"><p>tag to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>var_args</p></td>
<td class="parameter_description"><p>tag / GValue pairs to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-tag-setter-get-tag-list"></a><h3>gst_tag_setter_get_tag_list ()</h3>
<pre class="programlisting">const <a class="link" href="GstTagList.html" title="GstTagList"><span class="returnvalue">GstTagList</span></a> *
gst_tag_setter_get_tag_list (<em class="parameter"><code><a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a> *setter</code></em>);</pre>
<p>Returns the current list of tags the setter uses.  The list should not be
modified or freed.</p>
<p>This function is not thread-safe.</p>
<div class="refsect3">
<a name="gst-tag-setter-get-tag-list.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>setter</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-tag-setter-get-tag-list.returns"></a><h4>Returns</h4>
<p>a current snapshot of the
taglist used in the setter or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if none is used. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-tag-setter-set-tag-merge-mode"></a><h3>gst_tag_setter_set_tag_merge_mode ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_tag_setter_set_tag_merge_mode (<em class="parameter"><code><a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a> *setter</code></em>,
                                   <em class="parameter"><code><a class="link" href="GstTagList.html#GstTagMergeMode" title="enum GstTagMergeMode"><span class="type">GstTagMergeMode</span></a> mode</code></em>);</pre>
<p>Sets the given merge mode that is used for adding tags from events to tags
specified by this interface. The default is <a class="link" href="GstTagList.html#GST-TAG-MERGE-KEEP:CAPS"><span class="type">GST_TAG_MERGE_KEEP</span></a>, which keeps
the tags set with this interface and discards tags from events.</p>
<div class="refsect3">
<a name="gst-tag-setter-set-tag-merge-mode.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>setter</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>mode</p></td>
<td class="parameter_description"><p>The mode with which tags are added</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-tag-setter-get-tag-merge-mode"></a><h3>gst_tag_setter_get_tag_merge_mode ()</h3>
<pre class="programlisting"><a class="link" href="GstTagList.html#GstTagMergeMode" title="enum GstTagMergeMode"><span class="returnvalue">GstTagMergeMode</span></a>
gst_tag_setter_get_tag_merge_mode (<em class="parameter"><code><a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a> *setter</code></em>);</pre>
<p>Queries the mode by which tags inside the setter are overwritten by tags
from events</p>
<div class="refsect3">
<a name="gst-tag-setter-get-tag-merge-mode.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>setter</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-tag-setter-get-tag-merge-mode.returns"></a><h4>Returns</h4>
<p> the merge mode used inside the element.</p>
</div>
</div>
</div>
<div class="refsect1">
<a name="GstTagSetter.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstTagSetter-struct"></a><h3>GstTagSetter</h3>
<pre class="programlisting">typedef struct _GstTagSetter GstTagSetter;</pre>
<p>Opaque <a class="link" href="GstTagSetter.html" title="GstTagsetter"><span class="type">GstTagSetter</span></a> data structure.</p>
</div>
<hr>
<div class="refsect2">
<a name="GstTagSetterInterface"></a><h3>struct GstTagSetterInterface</h3>
<pre class="programlisting">struct GstTagSetterInterface {
  GTypeInterface g_iface;

  /* signals */

  /* virtual table */
};
</pre>
<p><a class="link" href="GstTagSetter.html#GstTagSetterInterface" title="struct GstTagSetterInterface"><span class="type">GstTagSetterInterface</span></a> interface.</p>
<div class="refsect3">
<a name="GstTagSetterInterface.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody></tbody>
</table></div>
</div>
</div>
</div>
</div>
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